package com.transcoachapp.database;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;

import com.transcoachapp.data.Bus;
import com.transcoachapp.data.Ferry;
import com.transcoachapp.data.Rail;
import com.transcoachapp.data.Station;

import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DataBaseHelper extends SQLiteOpenHelper {

	// The Android's default system path of your application database.
	private static String DB_PATH = "/data/data/com.transcoachapp/databases/";

	private static String DB_NAME = "transportation";

	private SQLiteDatabase myDataBase;

	private final Context myContext;

	/**
	 * Constructor Takes and keeps a reference of the passed context in order to
	 * access to the application assets and resources.
	 * 
	 * @param context
	 */
	public DataBaseHelper(Context context) {

		super(context, DB_NAME, null, 1);
		this.myContext = context;
	}

	/**
	 * Creates a empty database on the system and rewrites it with your own
	 * database.
	 * */
	public void createDataBase() throws IOException {

		boolean dbExist = checkDataBase();

		if (dbExist) {
			// do nothing - database already exist
		} else {

			// By calling this method and empty database will be created into
			// the default system path
			// of your application so we are gonna be able to overwrite that
			// database with our database.
			this.getReadableDatabase();

			try {

				copyDataBase();

			} catch (IOException e) {
				Log.i("db","Error copying database");
				throw new Error("Error copying database");

			}
		}

	}

	private boolean checkDataBase() {

		SQLiteDatabase checkDB = null;

		try {
			String myPath = DB_PATH + DB_NAME;
			checkDB = SQLiteDatabase.openDatabase(myPath, null,
					SQLiteDatabase.OPEN_READONLY);

		} catch (SQLiteException e) {

			Log.i("db","database does't exist yet.");

		}

		if (checkDB != null) {

			checkDB.close();

		}

		return checkDB != null ? true : false;
	}

	/**
	 * Copies your database from your local assets-folder to the just created
	 * empty database in the system folder, from where it can be accessed and
	 * handled. This is done by transfering bytestream.
	 * */
	private void copyDataBase() throws IOException {

		// Open your local db as the input stream
		InputStream myInput = myContext.getAssets().open(DB_NAME);

		// Path to the just created empty db
		String outFileName = DB_PATH + DB_NAME;

		// Open the empty db as the output stream
		OutputStream myOutput = new FileOutputStream(outFileName);

		// transfer bytes from the inputfile to the outputfile
		byte[] buffer = new byte[1024];
		int length;
		while ((length = myInput.read(buffer)) > 0) {
			myOutput.write(buffer, 0, length);
		}

		// Close the streams
		myOutput.flush();
		myOutput.close();
		myInput.close();

	}

	public void openDataBase() throws SQLException {

		// Open the database
		try {
		String myPath = DB_PATH + DB_NAME;
		myDataBase = SQLiteDatabase.openDatabase(myPath, null,
				SQLiteDatabase.OPEN_READONLY);
		} catch (SQLException e) {
			Log.i("db","error opening database");
		}

	}

	@Override
	public synchronized void close() {

		if (myDataBase != null)
			myDataBase.close();

		super.close();

	}

	@Override
	public void onCreate(SQLiteDatabase db) {

	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

	}
    public ArrayList<Bus> getBusList(String input) throws SQLException {
    	
    	if (myDataBase == null)  
        this.openDataBase();
    	
        ArrayList<Bus> busList = new ArrayList<Bus>();
        Cursor c;
        if (input==null || input.equals(""))
        	c = myDataBase.rawQuery("SELECT * FROM routes ORDER BY route_code asc,route_name asc", null);
        else
        	c = myDataBase.rawQuery("SELECT * FROM routes WHERE route_code like '"+input+"%"+"' or route_name like '"+input+"%"+"' ORDER BY route_code ASC,route_name ASC", null);
            
 
        while(c.moveToNext())
        {
            busList.add(new Bus(c.getInt(0), c.getString(1), c.getString(2), c.getString(3),c.getString(4), c.getString(5), c.getString(6)));
        }
        return busList;
 
    }

    public ArrayList<Ferry> getFerryList(String input) throws SQLException {
    	
    	if (myDataBase == null) 
        this.openDataBase();
        
    	ArrayList<Ferry> ferryList = new ArrayList<Ferry>();
        Cursor c;
        if (input==null || input.equals(""))
        	c = myDataBase.rawQuery("SELECT * FROM ferry ORDER BY name asc", null);
        else
        	c = myDataBase.rawQuery("SELECT * FROM ferry WHERE name like '"+input+"%"+"' ORDER BY name asc", null);
            
 
        while(c.moveToNext())
        {
        	ferryList.add(new Ferry(c.getInt(0), c.getString(1), c.getString(2), c.getString(3)));
        }
        return ferryList;
 
 
    }
	
    public ArrayList<Rail> getRailList(String input) throws SQLException {
    	
      	if (myDataBase == null) 
        this.openDataBase();
      	
        ArrayList<Rail> railList = new ArrayList<Rail>();
        Cursor c;
        if (input==null || input.equals(""))
        	c = myDataBase.rawQuery("SELECT * FROM rail ORDER BY name asc", null);
        else
        	c = myDataBase.rawQuery("SELECT * FROM rail WHERE name like '"+input+"%"+"' or code like '"+input+"%"+"' ORDER BY name asc,code asc", null);
            
 
        while(c.moveToNext())
        {
        	railList.add(new Rail(c.getInt(0), c.getString(1), c.getString(2), c.getString(3),c.getString(4),c.getString(5)));
        }
        return railList;
 
 
    }
	public ArrayList<Station> getStationList(String input) {
		if (myDataBase == null) 
	        this.openDataBase();
	      	
	        ArrayList<Station> stationList = new ArrayList<Station>();
	        Cursor c;
	        if (input==null || input.equals(""))
	        	c = myDataBase.rawQuery("SELECT * FROM stations GROUP BY substr(station_code,1,5) ORDER BY station_name asc", null);
	        else
	        	c = myDataBase.rawQuery("SELECT * FROM stations WHERE station_name like '"+input+"%"+"' GROUP BY substr(station_code,1,5) ORDER BY station_name asc,station_code asc", null);
	            
	 
	        while(c.moveToNext())
	        {
	        	stationList.add(new Station(c.getString(1), c.getString(2), c.getString(3)));
	        }
	        return stationList;
		
		
	}

	// Add your public helper methods to access and get content from the
	// database.
	// You could return cursors by doing "return myDataBase.query(....)" so it'd
	// be easy
	// to you to create adapters for your views.

}
/**
 * Check if the database already exist to avoid re-copying the file each time
 * you open the application.
 * 
 * @return true if it exists, false if it doesn't
 */
